Workshop Manual
Husqvarna Chain Saws
101
Air filter
LIST OF CONTENTS
Tank unit
Anti-vibration system
Updates
Safety
INTRODUCTION
General
Dismantling and reassembly of the entire chain saw
Repair of a specific sub-assembly
INTRODUCTION
General Instructions
SAFETY REGULATIONS
Special instructions
6 - English
TECHNICAL DATA
TECHNICAL DATA
8 - English
TECHNICAL DATA
TECHNICAL DATA
10 - English
TECHNICAL DATA
TECHNICAL DATA
12 - English
TECHNICAL DATA
TECHNICAL DATA
Tools for all chain saws
TOOLS
502 50 57-01 3/16 502 50 16-01 6 mm 502 50 64-01 5 mm
502 50 18-01 4 mm 502 50 19-01 3 mm 502 50 88-01 5 mm
Tools for saws 40, 45, 51 and
Tools for saws 36 and
TOOLS
compl 502 50
Tools for saws 254, 257 and
Tools for saws 42, 242 and
TOOLS
compl 502 51
Tools for saws 281 and
Tools for saws 61, 268 and
TOOLS
compl 502 51
TOOLS
Tools for saws 394 and
3 mm 4 mm 5 mm 3/16 8 mm 10 mm 502 50
compl 502 51
TOOLS
List of tools
Order number
Designation
Character key
SERVICE DATA Saws 36 and
English
SERVICE DATA
Character key
SERVICE DATA Saws 42, 242 and
22 - English
English
SERVICE DATA
SERVICE DATA
Saws 40 and
Character key
24 - English
English
SERVICE DATA
SERVICE DATA
Saws 51 and
Character key
26 - English
3-4English
SERVICE DATA
5254
SERVICE DATA Saws 254 and
Character key
28 - English
English
SERVICE DATA
Character key
SERVICE DATA
30 - English
English
SERVICE DATA
Character key
SERVICE DATA Saws 61, 268 and
32 - English
English
SERVICE DATA
Character key
SERVICE DATA Saws 281 and
34 - English
English
SERVICE DATA
Character key
SERVICE DATA
36 - English
20-22,5 10-12 12-14
SERVICE DATA
30-40 2-3
3-5 5-6
Character key
SERVICE DATA Saw
38 - English
English
SERVICE DATA
Starting
TROUBLE SHOOTING Trouble shooting schematic
Idling low rpm
Idling low rpm cont
Trouble shooting methods
TROUBLE SHOOTING
High rpm
Acceleration and retardation
Chain brake
SAFETY EQUIPMENT
Dismantling
Wear protective glasses
SAFETY EQUIPMENT
Assembly
Cleaning and Inspection
SAFETY EQUIPMENT
44 - English
SAFETY EQUIPMENT
46 - English
SAFETY EQUIPMENT
SAFETY EQUIPMENT
Checking brake operation
The engine should not be running during the test
Description
SAFETY EQUIPMENT Chain catcher
Replacing
SAFETY EQUIPMENT
Muffler
Dismantling
Do not touch the muffler until it has cooled. Risk of burns
Cleaning and Inspection
SAFETY EQUIPMENT
Assembly
when working on a catalytic converterWARNING
Cleaning and Inspection
SAFETY EQUIPMENT Stop switch
Assembly
Dismantling
SAFETY EQUIPMENT
Throttle lock
Dismantling
The fuel used in the chain saw poses the following hazards
SAFETY EQUIPMENT
SAFETY EQUIPMENT
Cleaning and inspection
Clean all parts
Check that the springs, where fitted, are
Assembly
SAFETY EQUIPMENT
The fuel used in the chain saw poses the following hazards
1. The liquid and its vapours are poisonous
56 - English
SAFETY EQUIPMENT
Dismantling
STARTER
Wear protective glasses
Cleaning and Inspection
Changing the ferrule
STARTER
Remove the parts of the old ferrule
STARTER
Assembly
Check the cord tension
STARTER
60 - English
Dismantling
ELECTRICAL SYSTEM Ignition system
ELECTRICAL SYSTEM
Assembly
Cleaning and Inspection
Clean all parts, especially the flywheel and shaft taper
ELECTRICAL SYSTEM
Fitting the spark plug cover
Stop switch
ELECTRICAL SYSTEM
64 - English
Handle heating
Trouble shooting
ELECTRICAL SYSTEM
Description
ELECTRICAL SYSTEM
Checking the power switch
Checking the generator
Checking the heat loops in the rear handles
Dismantling
CENTRIFUGAL CLUTCH
Clean all parts and inspect the following
Cleaning and Inspection
CENTRIFUGAL CLUTCH
CENTRIFUGAL CLUTCH
Assembly
NOTE! The bearing can also be greased later through the hole on the crankshaft
Dismantling
LUBRICATION SYSTEM
70 - English
LUBRICATION SYSTEM
72 - English
LUBRICATION SYSTEM
51/55
40/45
LUBRICATION SYSTEM
36/41
40/45
LUBRICATION SYSTEM
74 - English
LUBRICATION SYSTEM
Dismantling the oil pumps worm gear
First screw the tool onto the entire worm gear
Turn the screw until the worm gear is removed
That the taper on the adjuster screw shows no signs of wear
Cleaning and Inspection
LUBRICATION SYSTEM
Assembling the oil pump
Assembling the worm gear
LUBRICATION SYSTEM
78 - English
LUBRICATION SYSTEM
LUBRICATION SYSTEM
Saws 42, 61, 242, 246, 254, 257, 262, 268, 272, 281, 288, 394 and
LUBRICATION SYSTEM
50/51
36/41
LUBRICATION SYSTEM
40/45
40/45
LUBRICATION SYSTEM
51/55
82 - English
Description
CARBURETTOR
Design
The fuel used in the chain saw poses the following hazards
Operation
CARBURETTOR
Dismantling
CARBURETTOR
The fuel used in the chain saw poses the following hazards
1. The liquid and its vapours are poisonous
Tillotson HS 255 B
Tillotson HS 228 B
CARBURETTOR
86 - English
Walbro HDA and HD
Tillotson HS 260 A
CARBURETTOR
Walbro WG
Walbro WJ
CARBURETTOR
88 - English
ZAMA C1Q-EL1
Walbro WT
CARBURETTOR
CARBURETTOR
Cleaning and Inspection
The fuel used in the chain saw poses the following hazards
1. The liquid and its vapours are poisonous
CARBURETTOR
Assembly
Plugs
The fuel used in the chain saw poses the following hazards
Tillotson HS 228 B
CARBURETTOR
92 - English
Tillotson HS 255 B
CARBURETTOR
Tillotson HS 260 A
CARBURETTOR
94 - English
CARBURETTOR
Walbro HDA och HD
Walbro WJ
CARBURETTOR
96 - English
Walbro WG
CARBURETTOR
Walbro WT
CARBURETTOR
98 - English
ZAMA C1Q-EL1
CARBURETTOR
Refitting onto chain saw
Pressure testing
CARBURETTOR
The fuel used in the chain saw poses the following hazards
268K, 272K and 272S
AIR FILTER
Prefilter
Compressed air at a high pressure can damage the foam
Main filter
AIR FILTER
102 - English
Cleaning and Inspection
TANK UNIT
Dismantling
The fuel used in the chain saw poses the following hazards
TANK UNIT
Bolts placed at
262XP
268K
TANK UNIT
Assembly
Ensure that the fuel pipe and throttle cable are not damaged
Description
ANTI-VIBRATION SYSTEM
Dismantling
106 - English
ANTI-VIBRATION SYSTEM
Assembly
Dismantling
PISTON AND CYLINDER
108 - English
PISTON AND CYLINDER
Cleaning and Inspection
1. The piston crown 2. The top of the cylinder bore
PISTON AND CYLINDER
Faults and causes
PISTON AND CYLINDER
Assembly
112 - English
PISTON AND CYLINDER
PISTON AND CYLINDER
Pressure testing
Decompression valve
Crankcase and cylinder
Dismantling
CRANKCASE AND CRANKSHAFT
Ensure that no dirt or foreign particles enter the bearings
CRANKCASE AND CRANKSHAFT
CRANKCASE AND CRANKSHAFT
Cleaning and Inspection
116 - English
CRANKCASE AND CRANKSHAFT
Assembly
Ensure that dirt and foreign particles do not enter the bearing
118 - English
CRANKCASE AND CRANKSHAFT
Ensure excess gasket material does not fall into the crankcase
CRANKCASE AND CRANKSHAFT
Ensure that dirt and foreign particles do not enter the bearing
CRANKCASE AND CRANKSHAFT
120 - English
CRANKCASE AND CRANKSHAFT
Bar bolts
CRANKCASE AND CRANKSHAFT
Changing the seals
Dismantling
CRANKCASE AND CRANKSHAFT
Assembly
3.5 mm
CRANKCASE AND CRANKSHAFT
42, 242, 246 1 mm
3120